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Air quality · Colorado, United States

Denver Air Quality Index (AQI) today

Modelled estimate for 05:00 local time (UTC-7), refreshed 3 Nov, 07:52 UTC+0.

23 Good

Live estimate · modelled

US EPA AQI05:00 UTC-7, 3 Nov Main pollutant: O₃

Air quality is satisfactory, and air pollution poses little or no risk.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 28.

Over the next 24 hours the model expects the AQI to range from 22 around 09:00 to 68 around 00:00 (4 Nov).

819th most polluted of 849 cities worldwide right now, 23rd of 25 in United States.

What to do today

  • Long walk or run outside OK
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is satisfactory, and air pollution poses little or no risk.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

06:00 · 57 07:00 · 62 08:00 · 63 09:00 · 61 10:00 · 57 11:00 · 55 12:00 · 47 13:00 · 33 14:00 · 22 15:00 · 18 16:00 · 19 17:00 · 20 18:00 · 21 19:00 · 21 20:00 · 21 21:00 · 20 22:00 · 20 23:00 · 20 00:00 · 20 01:00 · 21 02:00 · 22 03:00 · 22 04:00 · 23 05:00 · 23 06:00 · 23 07:00 · 27 08:00 · 27 09:00 · 22 10:00 · 22 11:00 · 23 12:00 · 25 13:00 · 27 14:00 · 30 15:00 · 31 16:00 · 32 17:00 · 33 18:00 · 39 19:00 · 54 20:00 · 58 21:00 · 61 22:00 · 64 23:00 · 67 00:00 · 68 01:00 · 68 02:00 · 67 03:00 · 66 04:00 · 63 05:00 · 62 06:00 · 62 07:00 · 62 08:00 · 61 09:00 · 58 10:00 · 54 11:00 · 48 12:00 · 39 13:00 · 31 14:00 · 26 15:00 · 31 16:00 · 34 17:00 · 36 18:00 · 37 19:00 · 49 20:00 · 55 21:00 · 58 22:00 · 60 23:00 · 61 00:00 · 60 Now

US EPA AQI per hour, UTC-7. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 06:0057
Mon 07:0062
Mon 08:0063
Mon 09:0061
Mon 10:0057
Mon 11:0055
Mon 12:0047
Mon 13:0033
Mon 14:0022
Mon 15:0018
Mon 16:0019
Mon 17:0020
Mon 18:0021
Mon 19:0021
Mon 20:0021
Mon 21:0020
Mon 22:0020
Mon 23:0020
Tue 00:0020
Tue 01:0021
Tue 02:0022
Tue 03:0022
Tue 04:0023
Tue 05:00 · Now23
Tue 06:00 · Forecast23
Tue 07:00 · Forecast27
Tue 08:00 · Forecast27
Tue 09:00 · Forecast22
Tue 10:00 · Forecast22
Tue 11:00 · Forecast23
Tue 12:00 · Forecast25
Tue 13:00 · Forecast27
Tue 14:00 · Forecast30
Tue 15:00 · Forecast31
Tue 16:00 · Forecast32
Tue 17:00 · Forecast33
Tue 18:00 · Forecast39
Tue 19:00 · Forecast54
Tue 20:00 · Forecast58
Tue 21:00 · Forecast61
Tue 22:00 · Forecast64
Tue 23:00 · Forecast67
Wed 00:00 · Forecast68
Wed 01:00 · Forecast68
Wed 02:00 · Forecast67
Wed 03:00 · Forecast66
Wed 04:00 · Forecast63
Wed 05:00 · Forecast62
Wed 06:00 · Forecast62
Wed 07:00 · Forecast62
Wed 08:00 · Forecast61
Wed 09:00 · Forecast58
Wed 10:00 · Forecast54
Wed 11:00 · Forecast48
Wed 12:00 · Forecast39
Wed 13:00 · Forecast31
Wed 14:00 · Forecast26
Wed 15:00 · Forecast31
Wed 16:00 · Forecast34
Wed 17:00 · Forecast36
Wed 18:00 · Forecast37
Wed 19:00 · Forecast49
Wed 20:00 · Forecast55
Wed 21:00 · Forecast58
Wed 22:00 · Forecast60
Wed 23:00 · Forecast61
Thu 00:00 · Forecast60

Pollutants this hour

  • PM2.5 2.7 µg/m³ 24-hour mean 5.1 µg/m³ · within WHO’s 24-hour guideline (15) 13
  • PM10 3 µg/m³ 2
  • O₃ 46 µg/m³ 23
  • NO₂ 14 µg/m³ 7
  • SO₂ 1 µg/m³ 0
  • CO 0.16 mg/m³ 1

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Oklahoma City Oklahoma 21
El Paso Texas 27
Ciudad Juárez Mexico 27
Phoenix Arizona 70
Fort Worth Texas 26
Dallas Texas 26
Mexicali Mexico 65

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Denver’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Denver right now?
23 on the US EPA scale (Good) at 05:00 UTC-7, 3 Nov. O₃ is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Denver today?
For most people, yes. The EPA’s statement for “Good”: Air quality is satisfactory, and air pollution poses little or no risk. General guidance, not medical advice.

Will the air in Denver get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 22 around 09:00 to 68 around 00:00 (4 Nov). Forecasts beyond a day are less certain.

How does Denver compare with other cities?
Right now it is the 819th most polluted of 849 cities we track worldwide, and 23rd of 25 in United States, all on the same US EPA scale.

Why does another app show a different AQI for Denver?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.